# If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.

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If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.

A) 144 cm

B) 144.1 cm

C) 144.2 cm

D) 144.4 cm

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Correct option is (B) 144.1 cm

The mean height of 10 boys $=\frac{3\times142+7\times145}{10}$

$=\frac{426+1015}{10}$

$=\frac{1441}{10}$ = 144.1 cm

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Correct option is  B) 144.1 cm